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Hey Everyone!
Here is the successor to my Lego Technic Chili Crawler, the Cactus Crawler It took about half of a year of design and revision to reach its current state, of which I am proud of.
THE VIDEO: youtube
Features:
- 3 L-Motors for drive (two in the rear axle, one in the front)
- M-Motor and a small linear actuator for front steering
- Rigid, triangulated 4-link suspension for the front axle, with large, soft, black shock absorbers
- Extremely rigid 2-link rear suspension with ball-joint pivot point on top of the axle, similar to that found in the RC "Mantis" crawler
- 100% Lego-legal custom curved rear links that, with how the main cab is shaped, provide exceptional ground clearance towards the rear of the crawler, allowing it to climb up relatively large vertical structures such as street curbs
- Very minimal, light bodywork
- BuWizz for extra power and SBrick for a great, custom control scheme Note: By the time I finished designing the cab and it's battery enclosure, BuWuzz had not yet come out with the update for their iOS app that allows a single joystick/slider to control multiple outputs, so I was forced to use an SBrick with the BuWizz, providing the extra power from the BuWizz, but with the ease-of-use and great custom control profiles of the SBrick. When used with the SBrick, the BuWizz does in fact still provide more power than the standard Lego 8878 LiPo battery box.
- RC4WD 1.9" Krypton scale tires
- Two green pieces so that I can call it the Cactus Crawler ;)
LXF hopefully coming soon, the tires can easily be found with a quick google search of their name.
YES, I know, there is no body. This is meant for performance, meaning I made the cab as small, light, and rigid as possible.
I will be able to reply intermittently throughout the day. I figured I'd put this up now anyway!
pt

Starting work on my next project, which will be a lifted Nissan Xterra! Got a full set of RC4WD Rock Crusher tires (essentially the same tread as the popular BF Goodrich tires), and I've also started modeling a fully functional transfer case based around the new (to me) driving rings.
New Tires and things! by VKTechnic, on Flickr
The green axle is the motor input, orange is rear axle drive, and yellow is front axle. In the middle, the lavender and blue gears are for HI/LO, respectively, and as expected, the FWD can be disconnected as a 2WD/4WD switch. Fairly compact, as the geared part is only 5x5x7 studs!
A couple of things are still undecided with this model, the first of which is how to activate the functions. Right now, the transfer case is actuated by mini LAs, which would mean that I would likely be using mini LAs to lock the front and rear diffs. However, there is the option to use small pneumatic cylinders, in which case the axles will be a little simpler to build (more on axles later). On the other hand, using pneumatics means integrating a pressure-regulated compressor and remote controlled valves (or a valve-pump combo), which could end up being bulky. I do have the option of manually controlling those functions, but what's the fun in that?
The other undecided aspect is suspension. The Xterra I'm modeling after has A-arms in the front and leaf springs in the rear, so from an accuracy standpoint that is the way to go. On the other hand, 4-link live axles front and rear would be great for off-roading. The tradeoff with 4-link suspension would be space, as independent suspension in the front would let me cram the driveline components in front of the "firewall".
TL;DR I've started on an Xterra, but I've got a lot of thinking to do...

We've just finished up the 2016 season today, resulting in what is very likely my best Truck Trial video ever (out of many), so I thought I'll share it with you. Plus, if there are any questions about the trucks or the competition (and there usually are), post them here and I'll try to answer.

Hi all!
Some days ago, there was a little talk about an international Truck Trial race in Zblj's topic. So, the competition happened, it was a great time, to meet each other again (most of us were in the first international TT meeting, in Keszthely, 2011). It was a bit of special event. The idea came from Mihai Dreve (Braker23 here), He planned a trip to Hungary, and asked us about a TT race. Then Zblj joined us, and became an international event with 3 countries: Romania, Slovenia, Hungary. I'll be advertise here, if there will be another international TT meeting, organized by us (Hungarian Lego Truck Trial Club / Malug).
This was the third international Truck Trial themed meeting in Hungary, in 7th of May, 2016. The location was the edge of Budapest, the Harmashatarhegy. It's our usual and most used place for TT, has many advantage, like large area, large variety of terrain, hills, stones, logs, etc.
Generally, our TT club is mostly private, it's a closed discussion (rules, location, day) usually, and we only publicize the advertisement (with final rules, etc.) of the race. We know about the possible participants, they are in the discussion.
Luckily, Agrof, and Lipko could also join us, so this event became a little Eurobricks meeting, too. Special thanks to Agrof for the awesome first prize! Can be seen at 18:21 in the video below. Thank you, Peter!
I put every important information, moments, good photos, shots, trucks, builders, results, and as many fun, as I found - in this video:
Watch in 1080p, with fullscreen:
Hope you will enjoy the video. More pictures, galleries will arrive soon, I'll put them here. I made another version of the video, with the original sounds, if someone needs, ask me in pm, and I'll send the dropbox link.
Comments, questions always welcomed.

Since the new Arocs relased with new suspension parts and a great idea for the rear axle I was thinking, why not also make small scale truck trial machines/races with 62,4mm wheels as a reference point.
I think this translates to roughly 1:13 scale.
Because this is a smaller scale the models should be easier to build with less parts and more structualy rigid
I think a max of 2 x XL, 3x L or 4x M motors should be enough at this scale...
What do you guys think?
Wanna debate, maybe even set up some guidelines and build something?
P.S. click here for some axle ideas at this scale

The second version of my Easy rider trial truck. The suspension remains the same.
RC4WD Mickey Thompson 1.55 BAJA mtz scale tires are used.
The main feature in the truck is programmable differential.
The truck is powered with two PF L motors. Each motor drives the wheels from on side of the truck.
Programmable differential between right and left wheels is realized with custom remote control by DGI.
Control features are used:
1. discrete acceleration and steering
2. while steering the inner wheels are being slowed down proportionally.
More photos.

Hello!
After a while, I'll post mocs again, and for starting, I choosed one of my latest creations, a Gaz 66 trial truck. This is my third Gaz66 Lego trial truck, now with 108 mm RC4WD custom tyres, as many technic vehicle has. Equipped with two RC buggy motors for propulsion and one PF M motor for steerig, built in the front axle.
The two RC motors are linked together with a central axle, however, they are located separately near to the front and rear axle. With this technique, they can help each other to move this truck over obstacles.
I tried to get close to original Gaz66 with the body, but angles and others, like ground clearance were also important. It can be precisely driven, thanks to the RC throttle with 3 levels and linked pendular suspension. This was made first of all for a Lego truck trial competition, organized by HUNLTC in Hungary:
Gaz66-024
Gaz66-023
Gaz66-022
Gaz66-021
Gaz66-020
Gaz66-019
Gaz66-018
The RC unit is also part of the frame:
Gaz66-016
Gaz66-015
Details:
Gaz66-013
Gaz66-012
Gaz66-010
The power transmitter axle between the two motors:
Gaz66-011
Gaz66-009
Gaz66-008
Gaz66-007
Gaz66-006
Yes, some scratches appeared after a long run on rocks and others, but I don't care, it's an outdoor built moc.
These angles can be done by suspension:
Gaz66-005
... and steering:
Gaz66-004
Gaz66-003
Top view:
Gaz66-002
Nowadays I have a new semi-pro camera, so from now, you can watch 1080p good quality videos, in my new creations. (but for old mocs, which are waiting for publicizing, I still only have the 480p videos). The slow motion parts were filmed with 1080p60fps and 320x240 at 240fps.
Video:

Hey Everyone,
I see that the crawlers are a big hit on this site. Just wanted to share one that I built a while ago and made a recent new video for. Pretty good climbing skills. Aesthetically, not much there, but I tried to keep the overall weight down to enhance functionality.
http://mocpages.com/moc.php/368692

Hi!
I began to develop Truck Trial competition in Sankt-Peterburg(Russia).Up to this point there weren't competition like this, so I started from Mini truck trial. Basic rules - the distance between the wheels 13-15 studs and the largest diameter wheels - 62 mm.
Soon, I will show to you video from meeting.
Off course I made short video with my truck. I found cool track in my garden
And some pictures of car.

Hello from Italy
I'm a fan of lego, lego technic in particular. I love build trial trucks and rock crawlers, try to improve them and make them similar to the real models.
I have a blog where there are many articles dedicated to my most beautiful creations..

Hello!
I'm just curious to know how many people here would be interested in doing some truck trial or similar event here in Brisbane, Australia.
For those not in Australia, any advice on holding a truck trials would be greatly appreciated! Rules Regulations, ect.
:D

Hello, this is my first Technic project on Eurobricks, so please bear with me if it seems not as good as the other creations here.
This is the Z-4 Titan. I created the Z-1 through 3 on NXTLOG, and you can see them in my NXTLOG Creations topic.
This is my second true Trial Truck, though it isn't based off any real-life vehicle. The first one used the same steering axle design, and a non-steered rear axle. It also only had one XL motor, mounted sideways and using a complex gear train to reach the common driveshaft. It was somewhat underpowered and unreliable, not to mention top-heavy, so I removed the axles and redesigned the rest. I also took apart the non-steered rear axle and copied the front steering one. Now, the Titan has 2 XL motors mounted between the axles, and each motor drives one axle. The axles are both 4-link (I think that is the right name), and each have an M motor for steering. As such, they have no mechanical link to each other and so the steering easily gets out of sync. The suspension uses Unimog parts, and other than them, is completely my design. Each M motor is geared down 1:9.
Here are some pics:
Thanks for looking! All comments and criticism are welcome. Keep in mind my selection of panels is small, so I can't do that good of a body design.

I present my newest trial truck, a pretty special one, this Mercedes Uniknick:
(folder: http://www.brickshel...ry.cgi?f=515930 )
ORIGINAL:
http://www.brickshel...spiration02.jpg
This construction has central steering, this allows to have only one gear from the driving motors to the wheels. Reduction is 5:1, or 3:1 (has enough torque with it). I didn't want to make an average central steered vehicle like dump trucks, so I decided to add something new. One of the problems was the stability. This kind of off road vehicles like to fall over, that's enough when one section(front or rear) is turned 90 degrees.
So this one has a linked like suspension, but with gears and turntables instead of links( not my idea, TT made it in this truck: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=444654 ):
So this construction allows to do these at the same time:
There is two version from this truck, one with PP wheels(secondary version) and the one with cutom RC4WD crawler tyres(primary model). The PP wheeled truck weights 1767 g, the crawler wheeled 1423 g. I know, it looks much better and realistic with the RC4WD tyres, that's the main reason I used them. The tyres give a bit better climbing abilities (PP wheels are still good), the highest obstacle was 1,5 times bigger than the wheels's diameter.
For steering there is one XL motor to have enough power to do it. It's necessary because of the 16 t turntable driving gears, there are two of them, one on each side to make the steering reliable. There weren't any problem with it.
Front lights:
The hardest part in the building process was to make the central part, to be reliable and functional with keeping the proportions of the original Uniknick.
I made a video for each version. Note the PP wheels abilities compared to the crawler tyre.
RC4WD Crawler wheel:
PP wheel:
Hope you like it.